桃夭门大桥基岩长周期设计反应谱  

DESIGN RESPONSE SPECTRA OF LONG PERIOD-GROUND MOTION FOR THE BEDROCK OF THE TAOYAOMEN BRIDGE SITE

作　　者：梁小华[1] 蒋溥[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《地震地质》2004年第4期772-783,共12页Seismology and Geology

摘　　要：文中结合舟山市桃夭门大桥抗震设计在长周期频段的需要,研究分析了桃夭门大桥场地基本地震地质环境特点和长周期地面运动谱的研究现状,从强震记录长周期分量信息特点出发,以强震记录为基础,选用了11个有代表性的M≥65的强震,共72条强震地面运动记录,参照核法规HAF0101(1)特定场地谱的确定方法,通过统计分析建立了以均值反应谱为基础的长周期反应谱。With the construction of more and more super high buildings and large scale flexible structures, great attention has been paid to information about long period response spectrum exceeding 4～6s, which is the basis of anti seismic design of large scale flexible structure. However, most of current anti seismic codes, such as the anti seismic design codes for highway construction used for the basis of large highway bridge design, are inadaptable just due to shortage of available information of the spectrum noted above. In consideration of the need of long period spectrum in the design of Taoyaomen large bridge in Zhoushan City, this paper focuses on the investigation and analysis of the basic characteristics of seismo geologic environments of the bridge site and presents the state of art of the research of long period ground motion spectrum. On the basis of the analysis of the basic characteristics of long period component of 72 ground motion records chosen from 11 representative strong earthquake records, as well as in the light of the determining method of ground spectrum for specific sites of the Nuclear Safety Code \, the long period response spectrum based on middle response spectrum is established in this paper through statistic analysis method. According to the basic forms and characteristics of the average spectrum of strong motion records, this paper utilizes zigzag spectral form to represent the average spectrum of strong motion records under various ground condition. In consideration of the reliability of strong motion records, especially the long period part, the average value of seismic response spectrum of the bedrock within period field spectrum is processed separately: those of less than 4.0s period build on data from all samples, and those of greater than 4.0s period build on more reliable ground motion records, involving mainly the samples with PGA of above 100gal (0.1 g ). Moreover, comparison has been made with some standard seismic response spectrum related to the Taoyaomen site, which includes

关 键 词：地震反应谱 地震动 抗震设计 桃夭门大桥 

分 类 号：P315.9[天文地球—地震学] U442.55[天文地球—固体地球物理学]